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    Characteristics of heat-treated Turkish pine and fir wood after ThermoWood processing
    (Triveni Enterprises, 2010) Sahin, Kol, H.
    The Finnish wood heat treatment technology, ThermoWood, was recently introduced to Turkey. Data about the mechanical and physical properties of Turkish woodspecies are importantforindustry andacademia. In this study, two industrially important Turkish wood species, pine (Pinus nigra Arnold.) and fir (Abies bornmülleriana Mattf.) were heat-treated using the Thermo Wood process. Pine and fir samples were thermally modified for 2 hr at 212 and 190°C, respectively. The modulus of rupture (MOR), modulus of elasticity in bending (MOE), impact bending strength (IBS), and compression strength (CS), in addition to swelling (Sw) and shrinkage (Sh) of thermallymodified wood were examined. The results indicate that the heat treatment method clearly decreased the MOR, MOE and IBS of pine and fir. However, a small increase was observed for CS values of heat treated wood species. The most affected mechanical properties were MORandIBS forboth pine andfir. The reduction in MOEwas smallerthan that in MORandIBS. Volumetric shrinkage andswelling of these specieswere alsoimproved'byapproximatelyhalf. In addition, the changesin the mechanical and physical properties studied in pine were larger than that of fir. © Triveni Enterprises, Lucknow (India).
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    Thermal conductivity of oak impregnated with some chemicals and finished
    (2010) Sahin, Kol, H.; Uysal, B.; Kurt, S.; Ozcan, C.
    The objective of this research was to investigate the effects of some impregnation materials and varnishes on the thermal conductivity of oak wood. Ammonium sulfate, borax, boric acid, zinc chloride, diammonium phosphate, and sodium silicate as impregnation chemicals and polyurethane, cellulosic, synthetic, coloured varnishes and cellulosic, synthetic, industrial paints as finishes were used. The wood materials were impregnated by using the vacuum-pressure method. The thermal conductivity test was performed based on the ASTM C 1113-99 hot-wire method. Results showed that the impregnation chemicals increased the thermal conductivity. The highest values were obtained with boric acid and sodium silicate. In addition, the thermal conductivity of painted oak was higher than that of varnished oak. The lowest thermal conductivity of 0.1465 Kcal/mh°C was obtained with the oak control. The highest thermal conductivity of 0.1756 Kcal/mh°C was obtained when oak was painted with industrial paint and impregnated with boric acid.